Aura H2O Unstable system

Apofis · 06-28-2017, 04:44 PM

I have almost 2 years that device and I always have problem with unstable system.
I have added hundred files (pdf, epub, mobi) and when I change pages in book list, system can freeze. Sometimes it freeze and reset self, sometimes I have do it myself.

After update firmware and have new home screen it seems to be more unstable. One time It enter to the restart loop, then I detached SDCard and it started correctly.

This is the same when I store files in internal memory.

What is wrong with this device?

mathil · 06-29-2017, 03:27 AM

That's not normal behaviour. Have you tried logging out of your account first and then logging in again? You might have a corrupt database.

Apofis · 06-30-2017, 05:01 PM

Yes, few weeks ago device had hard reset and I setup all again.
But I do not why, I still have collection saved in device, but they are empty.

mathil · 06-30-2017, 05:57 PM

And did that solve your problem? You should also check if the memory is full, and in general make sure that you are not loading files that are too big on the device. E-readers (all of them, not just the Kobo's) have slow processors and have less RAM than even the cheapest smartphone you could buy nowadays, they are not equipped for big PDFs or CBR/CBZ files. I would say not to load files bigger than 100mb if you don't want to experience your device slowing down excessively or freezing.

IIRC, the collections themselves are saved to the cloud, but if you didn't buy your books from Kobo, you'll have to re-add all your sideloaded books to their own collections. What most people on mobileread do is using Calibre to create them automatically based on tags (etc. series, the author's name etc.). You can find out how by checking the Mobileread wiki's article 'Kobo Shelves and Collections'.

davidfor · 06-30-2017, 08:06 PM

This doesn't sound like a problem with large books. And the only problems I have seen with large books is performance, and an occasional sickel reboot. And in recent firmware, the latter seems to be only for large kepubs. Both of these problems happen when opening books and reading them.

The problem that can affect paging in the lists is generating the cover images. For everything except kepubs, this is created by rendering the first page of the book. Apart from some slowness, I haven't seen any issues with this except in the firmware versions when sickel was first introduced. This was 3.17 or thereabouts and I'm pretty sure it was only large PDFs that triggered it.

If it is related to the cover image generation, it would be worse with the SD card. For books in the main memory, the images are stored. For books on the SD card, they are not. They are cached in memory for a while, but need to be renegerated when needed. That means it's likely that the problem will keep happening whenever you reach a certain page with books on the SD card, but, for the main memory, it will only need to generate covers that weren't the last time you got to that page. A workaround for this is using calibre to generate and send the covers to the device. It can do this for books on both the main memory and SD card. And if they exist on the card, the device will use them.

If this has been consistently happening for two years, then I'd suspect a hardware problem. The only thing you can change is the internal SD card. For the H2O, changing it means breaking the waterproofing.

Before doing that, the things I would try a factory reset and only putting a small number of epubs on the device to start with. I would convert all the MOBI to epub. I doubt this is a problem, but the overall handling of epub is much better than MOBI, so it will eliminate a variable. Same goes for PDF, at least for a while. They should be OK, but, except for PDF sized for a small page, I just don't find them a pleasant experience. Then try generating the cover images using calibre. You can do this when sending the books, or later using my Kobo Utilities plugin.

If none of that helps, it's time to open the device.

Apofis · 07-07-2017, 02:14 AM

I will try to create images by Calibre and decrease number of books.
In earlier firmware version in book list I could find option to show only titles, without cover. Now I can't find this option.

davidfor · 07-07-2017, 02:49 AM

Quote:

Originally Posted by Apofis

I will try to create images by Calibre and decrease number of books.
In earlier firmware version in book list I could find option to show only titles, without cover. Now I can't find this option.

Unfortunately for the people who like this option, it has been removed.

06-28-2017, 04:44 PM	#1
Apofis Junior Member Posts: 5 Karma: 10 Join Date: Jun 2017 Device: Aura H20	Unstable system I have almost 2 years that device and I always have problem with unstable system. I have added hundred files (pdf, epub, mobi) and when I change pages in book list, system can freeze. Sometimes it freeze and reset self, sometimes I have do it myself. After update firmware and have new home screen it seems to be more unstable. One time It enter to the restart loop, then I detached SDCard and it started correctly. This is the same when I store files in internal memory. What is wrong with this device?

06-30-2017, 05:57 PM	#4
mathil Evangelist Posts: 445 Karma: 287725 Join Date: Sep 2014 Location: Europe Device: Kobo Aura H2O/Glo HD/Libra 2, Kindle PW3/PW5/PW11, Boox Palma	And did that solve your problem? You should also check if the memory is full, and in general make sure that you are not loading files that are too big on the device. E-readers (all of them, not just the Kobo's) have slow processors and have less RAM than even the cheapest smartphone you could buy nowadays, they are not equipped for big PDFs or CBR/CBZ files. I would say not to load files bigger than 100mb if you don't want to experience your device slowing down excessively or freezing. IIRC, the collections themselves are saved to the cloud, but if you didn't buy your books from Kobo, you'll have to re-add all your sideloaded books to their own collections. What most people on mobileread do is using Calibre to create them automatically based on tags (etc. series, the author's name etc.). You can find out how by checking the Mobileread wiki's article 'Kobo Shelves and Collections'. Last edited by mathil; 06-30-2017 at 06:05 PM.

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06-29-2017, 03:27 AM	#2
mathil Evangelist Posts: 445 Karma: 287725 Join Date: Sep 2014 Location: Europe Device: Kobo Aura H2O/Glo HD/Libra 2, Kindle PW3/PW5/PW11, Boox Palma	That's not normal behaviour. Have you tried logging out of your account first and then logging in again? You might have a corrupt database.

06-30-2017, 05:01 PM	#3
Apofis Junior Member Posts: 5 Karma: 10 Join Date: Jun 2017 Device: Aura H20	Yes, few weeks ago device had hard reset and I setup all again. But I do not why, I still have collection saved in device, but they are empty.

06-30-2017, 08:06 PM	#5
davidfor Grand Sorcerer Posts: 24,905 Karma: 47303824 Join Date: Jul 2011 Location: Sydney, Australia Device: Kobo:Touch,Glo, AuraH2O, GloHD,AuraONE, ClaraHD, Libra H2O; tolinoepos	This doesn't sound like a problem with large books. And the only problems I have seen with large books is performance, and an occasional sickel reboot. And in recent firmware, the latter seems to be only for large kepubs. Both of these problems happen when opening books and reading them. The problem that can affect paging in the lists is generating the cover images. For everything except kepubs, this is created by rendering the first page of the book. Apart from some slowness, I haven't seen any issues with this except in the firmware versions when sickel was first introduced. This was 3.17 or thereabouts and I'm pretty sure it was only large PDFs that triggered it. If it is related to the cover image generation, it would be worse with the SD card. For books in the main memory, the images are stored. For books on the SD card, they are not. They are cached in memory for a while, but need to be renegerated when needed. That means it's likely that the problem will keep happening whenever you reach a certain page with books on the SD card, but, for the main memory, it will only need to generate covers that weren't the last time you got to that page. A workaround for this is using calibre to generate and send the covers to the device. It can do this for books on both the main memory and SD card. And if they exist on the card, the device will use them. If this has been consistently happening for two years, then I'd suspect a hardware problem. The only thing you can change is the internal SD card. For the H2O, changing it means breaking the waterproofing. Before doing that, the things I would try a factory reset and only putting a small number of epubs on the device to start with. I would convert all the MOBI to epub. I doubt this is a problem, but the overall handling of epub is much better than MOBI, so it will eliminate a variable. Same goes for PDF, at least for a while. They should be OK, but, except for PDF sized for a small page, I just don't find them a pleasant experience. Then try generating the cover images using calibre. You can do this when sending the books, or later using my Kobo Utilities plugin. If none of that helps, it's time to open the device.

07-07-2017, 02:14 AM	#6
Apofis Junior Member Posts: 5 Karma: 10 Join Date: Jun 2017 Device: Aura H20	I will try to create images by Calibre and decrease number of books. In earlier firmware version in book list I could find option to show only titles, without cover. Now I can't find this option.

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